The former Newcastle Knights star, who scored a hat-trick of tries in the Wolves' 40-14 romp at the DW Stadium in June, was again their hero, pouncing for an opportunist 80-metre try to seal victory in his side's first game for three weeks.

With the Wolves leading 14-8 and the game still in the balance, Wigan went hard at the opposition line.

But they spilt the ball as Liam Marshall was hit and it was Mamo who swooped before sprinting 80 metres to score the try that secured the victory.

Tempers began to spill over in the final quarter and Mamo and Wigan forward Oliver Partington were then both sin-binned for fighting, marking an incident-packed match for the Australian.

Wigan coach Adrian Lam said referee Robert Hicks was wrong not to refer Mamo's late try to the video referee and believes he should have awarded a penalty instead for foul play by Warrington winger Josh Charnley (on Marshall).

"I thought it was disgraceful," Lam said. "We're meant to be looking at the welfare of our players and the player got kicked on the head.

"Whether it was accidental or not, I don't know but it's a penalty and he should have stopped play and gone to the video referee.

"He could still have awarded the try going back through the footage. It was clear that he was knocked out."

Wolves coach Steve Price said he had no issue with the awarding of Mamo's try.

"You've got to play to the whistle," he said. "It was totally accidental."

Lam revealed Marshall failed his head injury assessment and will not play against Leigh on Sunday.

Australian Associated Press